| http://www.w3.org/ns/prov#value | - This one is interesting too: http://www.stanford.edu/group/gcep/pdfs/symposium2012/MikDale_Symp2012_web.pdf (it describes how the pv industry until now has been an energy sink, because the panels produced are mostly still at the beginning of their life and have not produced enough energy to offset the input)
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